﻿using System;
using System.Security.Cryptography;
using System.Text;

namespace RxxApi.Common.Helper;

public class MD5Helper
{
    /// <summary>
    /// 16位MD5加密
    /// </summary>
    /// <param name="password"></param>
    /// <returns></returns>
    public static string MD5Encrypt16(string password)
    {
        var md5 = MD5.Create();
        string t2 = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(password)), 4, 8);
        t2 = t2.Replace("-", string.Empty);
        return t2;
    }

    /// <summary>
    /// 32位MD5加密
    /// </summary>
    /// <param name="password"></param>
    /// <returns></returns>
    public static string MD5Encrypt32(string password = "")
    {
        string pwd = string.Empty;
        try
        {
            if (!string.IsNullOrEmpty(password) && !string.IsNullOrWhiteSpace(password))
            {
                MD5 md5 = MD5.Create(); //实例化一个md5对像
                // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　
                byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(password));
                // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
                foreach (var item in s)
                {
                    // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符 
                    pwd = string.Concat(pwd, item.ToString("X2"));
                }
            }
        }
        catch
        {
            throw new Exception($"错误的 password 字符串:【{password}】");
        }
        return pwd;
    }

    /// <summary>
    /// 64位MD5加密
    /// </summary>
    /// <param name="password"></param>
    /// <returns></returns>
    public static string MD5Encrypt64(string password)
    {
        // 实例化一个md5对像
        // 加密后是一个字节类型的数组，这里要注意编码UTF8/Unicode等的选择　
        MD5 md5 = MD5.Create();
        byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(password));
        return Convert.ToBase64String(s);
    }
    /// <summary>
    /// Sha1加密
    /// </summary>
    /// <param name="str">要加密的字符串</param>
    /// <returns>加密后的十六进制的哈希散列（字符串）</returns>
    public static string Sha1(string str, string format = "x2")
    {
        var buffer = Encoding.UTF8.GetBytes(str);
        var data = SHA1.Create().ComputeHash(buffer);
        var sb = new StringBuilder();
        foreach (var t in data)
        {
            sb.Append(t.ToString(format));
        }
        return sb.ToString();
    }
    /// <summary>
    /// Sha256加密
    /// </summary>
    /// <param name="str">要加密的字符串</param>
    /// <returns>加密后的十六进制的哈希散列（字符串）</returns>
    public static string Sha256(string str, string format = "x2")
    {
        var buffer = Encoding.UTF8.GetBytes(str);
        var data = SHA256.Create().ComputeHash(buffer);
        var sb = new StringBuilder();
        foreach (var t in data)
        {
            sb.Append(t.ToString(format));
        }
        return sb.ToString();
    }
}
